Texcaller is a convenient interface
to the TeX command line tools
that handles all kinds of errors without much fuzz.
It is written in plain C,
is fairly portable,
and has no external dependencies besides TeX.

wwan-helper is a script that
establishes a UMTS connection
using a Ericsson F3507g Mobile Broadband Module.
It was designed to be used with a ThinkPad T420s.
It takes care of resetting and reinitializing the modem
if the hardware fails to get a WWAN connection,
and retries as often as necessary
until the UMTS connection is really established.
It is meant to run as a hook script for the ifup / ifdown mechanism,
but should also work on other networking systems.

Bitcoinproof creates a forgery-proof timestamp for your data,
secured by the Bitcoin network.
It allows you to prove
that a certain event happened before a certain point in time.
Maybe you want to prove that the damage in your flat
already existed when you moved in,
or that you were in possession of a great artwork
before it was published,
proving you are the author.

MXE (M cross environment) is a Makefile that
compiles a cross compiler and cross compiles
many free libraries such as SDL and Qt. Thus,
it provides a nice cross compiling environment
for various target platforms.

This is the summary of a short, unprepared talk
I gave on 2012-01-17 at the
Berlin PHP UserGroup.
In that meeting,
everyone was invited to present
their favourite editor or IDE.
So I demonstrated my current way of doing things.

Debian provides the qmail-1.03 source with some patches already applied.
Thus, some other patches won't work.
This site provides slightly modified versions of some popular patches
that work with Debian's qmail sources.

DAVIS is an easy and useful language for IRC bots.
It contains our own bots, some bots for demonstration,
a parser that creates Java, C, Perl and IRC-Script code out of a DAVIS file,
and an interpreter for DAVIS files.

In 2003 we entered the
"Jugend forscht"
(youth does research)
contest with DAVIS as our project.

It is possible to hang up a picture on two nails such that it falls
down if only one of the two nails breaks. Since this is some kind
of optimization of Murphy's law, I call such an arrangement
"murphystic". This can be generalized to any number of nails and
is a popular funny exercise on the theory of fundamental groups.

Murpi is a program that generates such arrangements and visializes
them as PostScript files.